Improvement in traps for sewers, sgc



2 Sheets-Sheet 1.

H. W. ATWATER. Trap for Sewers, 8:0.

Patented May 6, 1879.

Fly, 2.

NFETERS, PNOTOJJTHOGRAPHER. WASHINGTON, D C.

Wfiasd Jaw/i; 9 4. KM.

UNITED STATES PATENT OEEIoE.

HENRY W. ATWATER, OF NEWTON, MASSACHUSETTS.

IMPROVEMENT IN TRAPS FOR SEWERS, 80C.

Specification forming part of Letters Patent No. 214,984, dated May 6,1879; application filed March '22, 1879.

To all whom it may concern.-

Be it known that I, HENRY W. ATWA'IER, of Newton, in the county ofMiddlesex and State of Massachusetts, have invented certain new anduseful Improvements in Traps for Street-Sewers, Water-Closets, and thelike, of which the following is a full, clear, concise, and exactdescription, reference being had to the accompanying drawings, makingapart hereof, in which- Figure 1 is an elevation of an appliance embodying my invention, part of the casing being broken away to show theinterior construction, and Fig. 2 is a vertical section. The otherfigures show details, and will be referred to below.

The object of my invention is to prevent the sewer-gas fromescapingthrough the pipes from the sewer or S traps; and the main partof my invention consists in a new form of trap composed of a casing witha top carrying the inlet-pipe and gate and a bottom having a chamberprojecting up from it to be connected with the outlet-pipe, all as willnow be more fully described.

In the drawings, A is the waste-pipe. B is the casing of my attachment.0 is the top of the attachment, and D is its bottom. In the top 0 is ahole, from which projects downward a pipe, E, as shown. Into this pipe Ethe pipe A empties, and it is advisable to make the pipe E larger at thetop than at the bottom, in order that a chamber may be formed, as shownin Fig. 2, around which cement may be placed, so as to form a gas-tightjoint between A and E.

From the bottom D extends upward a chamber, F, into which the pipe Edischarges, this chamber F discharging into a pipe leading into thesewer or S trap below. Hinged to the bottom of the pipe E is a gate, 6,counterbalanced,

so that a weight upon its top will cause it to open and allow whateverstrikes upon it to fall into the chamber and outlet-pipe below, and thewalls of the chamber should be high enough to catch all of the sewagewhich escapes from the pipe E, and should be of such a shape as not tointerfere at all with the free swinging of the gate 6. The best shapefor the purpose is that shown in the drawings. (See Figs. 2 and 5.) 1have found it best to slant the bottom of the pipe E, placing the hingeof the gate 6 upon the shortest side of the pipe E, as shown, so thatwhatever falls on the gate will slide away from the hinge and nottowardit to clog it. This attachment is held together by bolts (1 d, which,passing through the top 0 and bottom D, clamp the casing B between 0 andD, and the joints between the casingB and its top 0 and bottom D shouldbe made gas-tight, either by grooves cut in O and D, into which thecasing fits, as shown in the drawings, or by cement or in some otherway.

In order that the joint between the gate 0 1 and the bottom of the pipeE may be gas-tight, I place a rubber ring, 0 around the bottom of thepipe E, the ring being beveled on its lower edge, as shown in Fig. 4, sothat when the gate bears against its lower edge it will be compressed,forming a joint which is tight in proportion to the weightpf thecounter-balance.

In order to regulate the counter-balance for the gate 0, I use a numberof weights, 6*, upon a rod, 6 as will be readily understood from Figs. 2and 6. By this means theweight of the counter-balance can be adjustedvery accurately, a perfectly gas-tight joint being insured withoutgreatly overbalancin g the gate 0.

1n the side of the casing B is a man-hole for use in case the interiorof my attachment needs repairing; and another part of my inventionrelates to an improved mode of fastening a cover on the man-hole.

G is the cover, which is provided with a rim, g, which fits over a rim,g, on the casing around the man-hole. g g are lugs attached to thiscasing, in which are holes, into which the ends of the cross-bar g fits.This cross-bar is provided with a thumb-screw, g, which is adaptedtobear against the center of the manhole cover and hold it against thecasing; and the chief novelty of this part of my invention consists inmaking this cross-bar a separate and dis tinct piece, so that it can beremoved and the man-hole cover and man-hole gotten at with less troublethan if this cross-bar were a part of the cover. (See Fig. 3.)

In practice I always use cement or a washer of some kind in connectionwith this cover to insure a gas-tight joint between the cover and thecasing.

My apparatus is very simple,and can be used,

if desired, with each water-closet in a house; but I find that generallyit is only necessary to use one in a house of ordinary size, that onebeing placed where the sewer-pipe leaves the house.

The size of my apparatus must, of course, depend upon ihe uses to whichit is to be put, and it should always be supplied with sufiicient waterto thoroughly cleanse it.

What I claim as my invention is 1. The trap above described, consistingof the top 0, having the pipe E and gate e, the casing B, and the bottomI), having the chamber F projecting up from it, all as set forth.

